Doubtful
Doubtful adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.
Unsolvable and doubtful are semantically related. In some cases you can use "Unsolvable" instead an adjective "Doubtful".
Unsolvable
Unsolvable adjective - Incapable of being solved or accomplished.
Usage example: an apparently unsolvable problem
Doubtful and unsolvable are semantically related. Sometimes you can use "Doubtful" instead an adjective "Unsolvable".
Mutual synonyms
Related pairs
- suspect and doubtful
- suspect and unsolvable
- dubious and doubtful
- dubious and unsolvable
- questionable and doubtful
- questionable and unsolvable
- obscure and doubtful
- obscure and unsolvable
- implausible and doubtful
- implausible and unsolvable
- shady and doubtful
- shady and unsolvable
- suspicious and doubtful
- suspicious and unsolvable
Cite this Source
Unsolvable and Doubtful. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/doubtful/unsolvable
Doubtful & Unsolvable. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/doubtful/unsolvable>.
Unsolvable or Doubtful. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/doubtful/unsolvable.
Google Ngram Viewer shows how "doubtful" and "unsolvable" have occurred on timeline